Nonaqueous inkjet ink composition

Abstract

An object is to provide a nonaqueous inkjet ink composition offering excellent solid filling property and anti-mottling property, as well as excellent ink stability, discharge stability, and scratch resistance, even when printed at high speed on printing targets whose printing face is constituted by a polyvinyl chloride, ethylene-vinyl acetate-based copolymer, or other vinyl-based polymer, etc. As a solution, a nonaqueous inkjet ink composition is provided that contains acrylic-based resin, organic coloring pigment and/or carbon black, alumina, pigment dispersant, and organic solvent, wherein the organic solvent comprises propylene carbonate, diethylene glycol dialkyl ether, and dipropylene glycol alkyl ether acetate, and alumina is contained by 5 to 30 parts by mass relative to 100 parts by mass representing the total of organic coloring pigment and carbon black.

What is claimed: 
     
       1. A nonaqueous inkjet ink composition containing acrylic-based resin, organic coloring pigment and/or carbon black, alumina, pigment dispersant, and organic solvent, wherein:
 the organic solvent comprises propylene carbonate, diethylene glycol dialkyl ether, and dipropylene glycol alkyl ether acetate; and 
 alumina is contained by 5 to 30 parts by mass relative to 100 parts by mass representing a total of organic coloring pigment and carbon black. 
 
     
     
       2. The nonaqueous inkjet ink composition according to  claim 1 , wherein the diethylene glycol dialkyl ether comprises diethylene glycol ethyl methyl ether and/or diethylene glycol diethyl ether. 
     
     
       3. The nonaqueous inkjet ink composition according to  claim 1 , wherein a mass ratio of diethylene glycol dialkyl ether to propylene carbonate is 1.0 to 15.0.